NOTE: as of libvirt 1.0.6, the VirtualBox driver will always
run inside the libvirtd daemon, instead of being built-in to the
libvirt.so library directly. This change was required due to the
fact that VirtualBox code is LGPLv2-only licensed, which is not
compatible with the libvirt.so license of LGPLv2-or-later. The
daemon will be auto-started when the first connection to VirtualBox
is requested. This change also means that it will not be possible
to use VirtualBox URIs on the Windows platform, until additional
work is completed to get the libvirtd daemon working there.